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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

matter go
that which has mass and occupies space

substance go
a particular kind or species of matter with uniform properties

antigen
any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies)

noun.substance

5 Subcategories

immunogen, immunizing agent go
any substance or organism that provokes an immune response (produces immunity) when introduced into the body
agglutinogen go
any substance that acts as an antigen to cause agglutinin production
fetoprotein, foetoprotein go
any of several antigens that occur naturally in the fetus and sometimes in adults with cancer
anatoxin, toxoid go
a bacterial toxin that has been weakened until it is no longer toxic but is strong enough to induce the formation of antibodies and immunity to the specific disease caused by the toxin
Rh, rhesus factor, Rh factor go
a blood group antigen possessed by Rh-positive people